/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.udf.api.customizer.strategy;

import java.time.ZoneId;

public class SessionTimeWindowAccessStrategy implements AccessStrategy {

    private final long displayWindowBegin;
    private final long displayWindowEnd;
    private final long sessionTimeGap;

    private ZoneId zoneId;

    /**
     * @param displayWindowBegin displayWindowBegin < displayWindowEnd
     * @param displayWindowEnd   displayWindowBegin < displayWindowEnd
     * @param sessionTimeGap     0 <= sessionTimeGap
     */
    public SessionTimeWindowAccessStrategy(
            long displayWindowBegin, long displayWindowEnd, long sessionTimeGap) {
        this.displayWindowBegin = displayWindowBegin;
        this.displayWindowEnd = displayWindowEnd;
        this.sessionTimeGap = sessionTimeGap;
    }

    /**
     * Display window begin will be set to the same as the minimum timestamp of the query result set,
     * and display window end will be set to the same as the maximum timestamp of the query result
     * set.
     *
     * @param sessionTimeGap 0 <= sessionTimeGap
     */
    public SessionTimeWindowAccessStrategy(long sessionTimeGap) {
        this.displayWindowBegin = Long.MIN_VALUE;
        this.displayWindowEnd = Long.MAX_VALUE;
        this.sessionTimeGap = sessionTimeGap;
    }

    @Override
    public void check() {
        if (sessionTimeGap < 0) {
            throw new RuntimeException(
                    String.format(
                            "Parameter sessionTimeGap(%d) should be equal to or greater than zero.",
                            sessionTimeGap));
        }
        if (displayWindowEnd < displayWindowBegin) {
            throw new RuntimeException(
                    String.format(
                            "displayWindowEnd(%d) < displayWindowBegin(%d)",
                            displayWindowEnd, displayWindowBegin));
        }
    }

    @Override
    public AccessStrategyType getAccessStrategyType() {
        return AccessStrategyType.SESSION_TIME_WINDOW;
    }

    public long getDisplayWindowBegin() {
        return displayWindowBegin;
    }

    public long getDisplayWindowEnd() {
        return displayWindowEnd;
    }

    public long getSessionTimeGap() {
        return sessionTimeGap;
    }

    public ZoneId getZoneId() {
        return zoneId;
    }

    public void setZoneId(ZoneId zoneId) {
        this.zoneId = zoneId;
    }
}
